package net.sunzc.base.wxpay1;

import java.security.MessageDigest;

public class MD5Util {

    private static String byteArrayToHexString (byte b[]) {
        StringBuffer resultSb = new StringBuffer ();
        for (int i = 0; i < b.length; i++)
            resultSb.append (byteToHexString (b[i]));

        return resultSb.toString ();
    }

    private static String byteToHexString (byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode (String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String (origin);
            MessageDigest md = MessageDigest.getInstance ("MD5");
            if (charsetname == null || "".equals (charsetname))
                resultString = byteArrayToHexString (md.digest (resultString
                        .getBytes ()));
            else
                resultString = byteArrayToHexString (md.digest (resultString
                        .getBytes (charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

}
